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Financial Highlights (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |
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Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 21, 2021 | Sep. 20, 2021
Investment Company, Financial Highlights [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net asset value, beginning balance (in dollars per share) |  |  |  |  | $ 16.34 | [1] |  |  |  |  | $ 15.50 | [1] | $ 16.34 | [1] | $ 15.50 | [1] | $ 16.80 | [1] | $ 17.38 |  | $ 18.28 |  |
Net investment income (loss) (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 1.56 | [2] | 1.31 | [2] | 1.39 | [2] | 1.54 |  | 1.61 |  |
Net realized (loss) gain and net change in unrealized (depreciation) appreciation on investments and (loss) gain on foreign currency (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | (0.68) |  | 0.79 |  | (1.57) |  | (0.63) |  | (1.03) |  |
Total net increase (decrease) (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 0.88 |  | 2.10 |  | (0.18) |  | 0.91 |  | 0.58 |  |
Shareholder distributions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions declared to stockholders from net investment income (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | (1.44) |  | (1.26) |  | (1.12) |  | (1.49) |  | (1.49) |  |
Capital share transactions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock above net asset value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |  | 0 |  | 0.01 |  |
Repurchases of common stock (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | 0.20 |  | 0 |  | 0 |  | 0 |  | 0 |  |
Net increase in net assets resulting from capital share transactions (in dollars per share) | $ 15.98 |  | $ 16.26 | $ 15.89 | $ 16.20 |  | $ 16.34 |  | $ 16.52 | $ 16.34 | $ 16.12 |  | 0.20 |  | 0 |  | 0 |  | 0 |  | 0.01 |  |
Net asset value, ending balance (in dollars per share) | $ 15.98 | [1] |  |  |  |  | $ 16.34 | [1] |  |  |  |  | $ 15.98 | [1] | $ 16.34 | [1] | $ 15.50 | [1] | $ 16.80 | [1] | $ 17.38 |  |
Shares outstanding at end of period (in shares) | 55,299,484 | [1] |  |  |  |  | 56,958,440 | [1] |  |  |  |  | 55,299,484 | [1] | 56,958,440 | [1] | 56,646,867 | [1] | 56,690,578 |  | 56,354,579 | 56,958,440 | 113,916,869
Total investment return-net value |  |  |  |  |  |  |  |  |  |  |  |  | 10.44% |  | 14.43% |  | (0.94%) |  | 5.55% |  | 2.98% |  |
Total investment return-market asset value |  |  |  |  |  |  |  |  |  |  |  |  | (14.87%) |  | 3.87% |  | 0.00% |  | 0.00% |  | 0.00% |  |
Net assets at beginning of period |  |  |  |  | $ 930,512 | [3] |  |  |  |  | $ 878,256 |  | $ 930,512 | [3] | $ 878,256 |  | $ 952,563 |  | $ 979,271 |  | $ 1,058,691 |  |
Net assets at end of period | $ 883,634 |  |  |  |  |  | $ 930,512 | [3] |  |  |  |  | 883,634 |  | 930,512 | [3] | 878,256 |  | 952,563 |  | 979,271 |  |
Average net assets for the period | $ 917,781 |  |  |  |  |  | $ 918,824 |  |  |  |  |  | $ 917,781 |  | $ 918,824 |  | $ 875,846 |  | $ 967,323 |  | $ 1,035,861 |  |
Ratio/Supplemental data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio of net investment income to average net assets |  |  |  |  |  |  |  |  |  |  |  |  | 9.61% |  | 8.09% |  | 8.99% |  | 9.03% |  | 8.71% |  |
Ratio of gross operating expenses to average net assets |  |  |  |  |  |  |  |  |  |  |  |  | 11.63% |  | 9.04% |  | 9.72% |  | 11.76% |  | 9.46% |  |
Ratio of net operating expenses to average net assets |  |  |  |  |  |  |  |  |  |  |  |  | 11.63% |  | 9.04% |  | 9.72% |  | 11.76% |  | 9.46% |  |
Portfolio turnover |  |  |  |  |  |  |  |  |  |  |  |  | 26.81% |  | 52.04% |  | 22.99% |  | 31.59% |  | 52.46% |  |
Total amount of senior securities outstanding |  |  |  |  |  |  |  |  |  |  |  |  | $ 957,500 |  | $ 830,000 |  | $ 725,000 |  | $ 841,042 |  | $ 898,542 |  |
Asset coverage ratio | 192000.00% |  |  |  |  |  | 212000.00% |  |  |  |  |  | 192000.00% |  | 212000.00% |  | 221000.00% |  | 213000.00% |  | 209000.00% |  |
Issuance of shares, per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  | $ 0.01 |  | $ 0.01 |  | $ 0.01 |  | $ 0.01 |  |
Repurchase of shares, per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  | $ 0.01 |  | $ 0.01 |  | $ 0.01 |  |
Number of shares (in shares) | 1 |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
[1] | As discussed in Note 3, the Company completed a two-to-one reverse stock split, effective as of September 21, 2021. The shares outstanding used in the computation of net asset value per share reflect the reverse stock split on a retroactive basis.
[2] | As discussed in Note 3, the Company completed a two-to-one reverse stock split, effective as of September 21, 2021. The weighted average shares used in the computation of the net increase (decrease) in net assets per share resulting from operations and net investment income per share reflect the reverse stock split on a retroactive basis.
[3] | Fair value determined in good faith by the Company’s board of directors (see Note 9) using significant unobservable inputs unless otherwise noted.

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